S
M
T
W
T
F
S
30
91°
64°
31
84°
62°
1
83°
68°
2
83°
66°
3
87°
63°
4
87°
69°
5
89°
69°
6
90°
62°
7
87°
62°
8
81°
61°
9
81°
61°
10
83°
64°
11
86°
61°
12
84°
60°
13
79°
59°
14
78°
66°
15
83°
65°
16
86°
58°
17
85°
57°
18
77°
55°
19
76°
57°
20
76°
62°
21
75°
62°
22
76°
56°
23
75°
59°
24
74°
58°
25
76°
61°
26
78°
62°
27
81°
55°
28
80°
53°
29
73°
59°
30
74°
59°
1
73°
60°
2
75°
58°
3
77°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mt. Pleasant
Mt. Pleasant's September 2026 forecast shows daily high temperatures ranging from 73° to 91°, with overnight lows between 52° and 69°. The average high for September is 81° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Mt. Pleasant. See also: October | November | December.
